Neckbeards
Neckbeards are, surprisingly enough, beards on necks. They generally appear as a result of shaving-related incompetence. They are widely believed to be a typical part of appearance of any nerd or roleplayer. This is a primary reason why users frequenting /tg/ are nicknamed "neckbeards" as well.
According to legend, great power can be gleaned by the possession of a neckbeard. Tales tell of a fa/tg/uy who had near-godlike levels of nerdrage, that were a direct result of his massive neckbeard.